Hydrogen transfer reduction of different ketones in ionic liquids
作者:Martin Hut’ka、Štefan Toma
DOI:10.1007/s00706-008-0853-0
日期:2008.7
Ionicliquids were tested as the reaction media for hydrogentransferreduction of substituted acetophenones and some other ketones with the [RuCl( TsDPEN )]2 complex as the catalyst. Reactions were going well and faster than in common solvents. Corresponding alcohols had high ee s in the case of aryl alkyl ketones, but just medium ee s were reached in the case of dialkyl or unsaturated ketones. An
测试了离子液体作为以[RuCl( TsDPEN )] 2配合物为催化剂,还原取代的苯乙酮和其他一些酮的氢转移的反应介质 。反应进行得比普通溶剂快得多。在芳烷基酮的情况下,相应的醇具有较高的 ee ,而在二烷基或不饱和酮的情况下,仅具有中等 ee 。观察到一个有趣的现象,即反应温度的升高对反应产物的 ee 没有负面影响 。
Linear β-amino alcohol catalyst anchored on functionalized magnetite nanoparticles for enantioselective addition of dialkylzinc to aromatic aldehydes
作者:Carla Sappino、Ludovica Primitivo、Martina De Angelis、Francesco Righi、Federica Di Pietro、Marika Iannoni、Luciano Pilloni、Stefano Vecchio Ciprioti、Lorenza Suber、Alessandra Ricelli、Giuliana Righi
DOI:10.1039/d0ra04554c
日期:——
A linear β-amino alcohol ligand, previously found to be a very efficientcatalyst for enantioselective addition of dialkylzinc to aromatic aldehydes, has been anchored on differently functionalized superparamagnetic core–shell magnetite–silica nanoparticles (1a and 1b). Its catalytic activity in the addition of dialkylzinc to aldehydes has been evaluated, leading to promising results, especially in
Bimetallic Catalysis: Asymmetric Transfer Hydrogenation of Sterically Hindered Ketones Catalyzed by Ruthenium and Potassium
作者:Tove Slagbrand、Tove Kivijärvi、Hans Adolfsson
DOI:10.1002/cctc.201500718
日期:2015.11
reduction of sterically hindered ketones under transfer‐hydrogenation conditions was developed. The corresponding chiral alcohols were obtained in good to excellent yields with enantiomeric excess values up to 99 %. The role of the cation associated with the base present in the reduction reaction was investigated. In contrast to previous studies on this catalyst system, potassium ions rather than lithium